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Handwriting ExemplarsSearch and Seizure

Obtaining a handwriting exemplar is not a seizure within the
meaning of the
Fourth Amendment. A person has no expectation of privacy in
handwriting because
it is a physical characteristic which is constantly exposed to the
public. So
long as the initial seizure of the person is reasonable, compelling
production
of a handwriting exemplar is permissible. SeeUnited
States v.
Mara, 410 U.S. 19 (1973).